Package: S7 0.2.2.9000

Hadley Wickham

S7: An Object Oriented System Meant to Become a Successor to S3 and S4

A new object oriented programming system designed to be a successor to S3 and S4. It includes formal class, generic, and method specification, and a limited form of multiple dispatch. It has been designed and implemented collaboratively by the R Consortium Object-Oriented Programming Working Group, which includes representatives from R-Core, 'Bioconductor', 'Posit'/'tidyverse', and the wider R community.

Authors:Object-Oriented Programming Working Group [cph], Davis Vaughan [aut], Jim Hester [aut], Tomasz Kalinowski [aut], Will Landau [aut], Michael Lawrence [aut], Martin Maechler [aut], Luke Tierney [aut], Hadley Wickham [aut, cre]

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manual.pdf |manual.html✨
DESCRIPTION |NEWS
card.svg |card.png
S7/json (API)

# Install 'S7' in R:
install.packages('S7', repos = c('https://rconsortium.r-universe.dev', 'https://cloud.r-project.org'))

Bug tracker:https://github.com/rconsortium/s7/issues

Pkgdown/docs site:https://rconsortium.github.io

On CRAN:

Conda:

19.47 score 494 stars 9.4k packages 740 scripts 1.4M downloads 75 exports 0 dependencies

Last updated from:a3924a38e7. Checks:11 OK, 3 NOTE, 1 ERROR. Indexed: yes.

TargetResultTimeFilesSyslog
linux-devel-arm64OK132
linux-devel-x86_64OK171
source / vignettesOK229
linux-release-arm64OK124
linux-release-x86_64OK164
macos-release-arm64NOTE161
macos-release-x86_64NOTE387
macos-oldrel-arm64OK151
macos-oldrel-x86_64OK433
windows-devel-arm64OK257
windows-devel-x86_64NOTE197
windows-release-arm64OK294
windows-release-x86_64ERROR103
windows-oldrel-x86_64OK193
wasm-releaseOK86

Exports::=as_classcheck_is_S7class_anyclass_atomicclass_callclass_characterclass_complexclass_data.frameclass_Dateclass_doubleclass_environmentclass_expressionclass_factorclass_formulaclass_functionclass_integerclass_languageclass_listclass_logicalclass_missingclass_nameclass_numericclass_POSIXctclass_POSIXltclass_POSIXtclass_rawclass_vectorconvertconvert_lazydeprecated_classdeprecated_genericdeprecated_propertymethodmethod_explainmethod<-methods_registernew_classnew_external_classnew_external_genericnew_genericnew_objectnew_propertynew_S3_classnew_unionpropprop_existsprop_infoprop_namesprop<-propsprops<-S4_containsS4_registerS7_classS7_class_descS7_classesS7_dataS7_data<-S7_dispatchS7_generic_callS7_generic_funS7_genericsS7_inheritsS7_methodsS7_objectS7_on_buildS7_on_loadS7_on_unloadS7_user_frameset_propssupervalid_eventuallyvalid_implicitlyvalidate

Dependencies:

Evolving S7 classes and generics
Changing a generic | Changing dispatch | Adding an argument | Removing an argument | Changing a default | Renaming a generic | Removing a generic | Moving a generic to another package | Changing a class | Adding a property | Removing a property | Renaming a property | Changing a property's type or validator | Renaming a class | Aliasing a class | Removing a class | Moving a class | Designing for evolution | Summary
Rendered fromevolution.Rmdusingknitr::rmarkdown

Last update: 2026-10-09
Started: 2026-10-06

Generics and methods
Generic-method compatibility | Generic with dots; method without dots | Generic and method with dots | Generic and method without dots | Customizing generics | Add required arguments | Add optional arguments | Do some work | super() | Multiple dispatch | A simple example | Special "classes"
Rendered fromgenerics-methods.Rmdusingknitr::rmarkdown

Last update: 2026-10-09
Started: 2023-05-08

Classes and objects
Validation | Basics | When is validation performed? | Avoiding validation | Properties | Default value | Computed properties | Dynamic properties | Common Patterns | Deprecated properties | Required properties | Frozen properties | Constructors
Rendered fromclasses-objects.Rmdusingknitr::rmarkdown

Last update: 2026-10-06
Started: 2023-05-08

Using S7 in a package
Getting started | Classes | Generics and methods | Methods for suggested packages | Backward compatibility | S3 | Older versions of R
Rendered frompackages.Rmdusingknitr::rmarkdown

Last update: 2026-09-25
Started: 2023-07-18

Compatibility with S3 and S4
S3 | Methods | Generics | Classes | List classes | S4 | S7 classes that extend S4 classes | S4 classes that extend S7 classes | Unions
Rendered fromcompatibility.Rmdusingknitr::rmarkdown

Last update: 2026-07-06
Started: 2022-03-18

Performance
Rendered fromperformance.Rmdusingknitr::rmarkdown

Last update: 2026-06-11
Started: 2021-03-17

S7 basics
Classes and objects | Generics and methods | Named bindings | Method dispatch and inheritance
Rendered fromS7.Rmdusingknitr::rmarkdown

Last update: 2026-06-11
Started: 2023-02-13

Motivation for S7
Challenges with S3 | Challenges with S4
Rendered frommotivation.Rmdusingknitr::rmarkdown

Last update: 2023-11-23
Started: 2023-07-10

Readme and manuals

Help Manual

Help pageTopics
Create and name an object in one step:=
S7 wrappers for base typesbase_classes class_atomic class_call class_character class_complex class_double class_expression class_function class_integer class_language class_list class_logical class_name class_numeric class_raw class_vector
S7 wrappers for key S3 classesbase_s3_classes class_data.frame class_Date class_factor class_formula class_POSIXct class_POSIXlt class_POSIXt
Dispatch on any classclass_any
Use an environment as the base type of an S7 classclass_environment
Dispatch on a missing argumentclass_missing
Convert an object from one type to anotherconvert
Non-strict conversionconvert_lazy
Deprecate a classdeprecated_class
Deprecate a genericdeprecated_generic
Deprecate a propertydeprecated_property
Find a method for an S7 genericmethod
Explain method dispatchmethod_explain
Register an S7 method for a genericmethod<-
Define a new S7 classnew_class new_object
Classes in other packagesnew_external_class
Generics in other packagesnew_external_generic
Define a new genericnew_generic S7_dispatch
Define a new propertynew_property
Declare an S3 classnew_S3_class
Define a class unionnew_union
Get/set a property@ @.S7_object prop prop<-
Property introspectionprop_exists prop_info prop_names
Get/set multiple propertiesprops props<- set_props
Register an S7, S3, or union class with S4S4_contains S4_register
Retrieve the class specification of an objectS7_class
Format a class specification as a stringS7_class_desc
Find S7 classes and generics in an environmentS7_classes S7_generics
Get/set underlying "base" dataS7_data S7_data<-
Access the generic call and user frame from within a methodS7_generic_call S7_generic_fun S7_user_frame
Does this object inherit from a class?check_is_S7 S7_inherits
List S7 methodsS7_methods
Package hooks for S7 methodsmethods_register S7_on_build S7_on_load S7_on_unload
Force method dispatch to use a superclasssuper
Validate an S7 objectvalidate valid_eventually valid_implicitly